The degree of stenosis/atherosclerosis is moderate at the high end...although it depends on your age and sex maybe..? If you're under 30, it might indicate being watchful for the next 10 years. If you're over 60, whew! You're doing pretty well. Unless something is going on and the rate of deposition accelerates, or IS accelerating, you are probably not going to die from atherosclerotic disease.

The antegrade flow in the vertebral artery is what you want to see AFAIK:
https://www.ncbi.nlm.nih.gov/books/NBK570624/#:~:text=The%20flow%20in%20the%20vertebral%20artery%20should%20be,vessel%20with%20prominent%20diastolic%20flow%20and%20spectral%20broadening.